compiler: use package path with embedded builtin type
compiler: use package path with embedded builtin type

The test case is https://go.dev/cl/414235.

Fixes golang/go#52856

Change-Id: I1e85cd56b0603c0480d5694ba2ceb058d0cb5cf9
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/414294
Reviewed-by: Than McIntosh <4b2922593166fc595a9b1a408f34f5d3817fe9d2@google.com>
Reviewed-by: Cherry Mui <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>

golang/gofrontend,golang/gofrontend,golang/gofrontend,golang/gofrontend